core/gatt-client: Add support for Includes property

Add implementation of Includes property in GATT service interface.
Include services are updated after exporting all services, when new service
has been added or service was removed.
diff --git a/src/gatt-client.c b/src/gatt-client.c
index 114981c..b86bfe6 100644
--- a/src/gatt-client.c
+++ b/src/gatt-client.c
@@ -72,6 +72,7 @@
 	bt_uuid_t uuid;
 	char *path;
 	struct queue *chrcs;
+	struct queue *incl_services;
 };
 
 typedef bool (*async_dbus_op_complete_t)(void *data);
@@ -1398,10 +1399,36 @@
 	return TRUE;
 }
 
+static void append_incl_service_path(void *data, void *user_data)
+{
+	struct service *incl_service = data;
+	DBusMessageIter *array = user_data;
+
+	dbus_message_iter_append_basic(array, DBUS_TYPE_OBJECT_PATH,
+					&incl_service->path);
+}
+
+static gboolean service_get_includes(const GDBusPropertyTable *property,
+					DBusMessageIter *iter, void *data)
+{
+	struct service *service = data;
+	DBusMessageIter array;
+
+	dbus_message_iter_open_container(iter, DBUS_TYPE_ARRAY, "{o}", &array);
+
+	queue_foreach(service->incl_services, append_incl_service_path, &array);
+
+	dbus_message_iter_close_container(iter, &array);
+
+	return TRUE;
+
+}
+
 static const GDBusPropertyTable service_properties[] = {
 	{ "UUID", "s", service_get_uuid },
 	{ "Device", "o", service_get_device },
 	{ "Primary", "b", service_get_primary },
+	{ "Includes", "ao", service_get_includes },
 	{ }
 };
 
@@ -1410,6 +1437,7 @@
 	struct service *service = data;
 
 	queue_destroy(service->chrcs, NULL);  /* List should be empty here */
+	queue_destroy(service->incl_services, NULL);
 	g_free(service->path);
 	free(service);
 }
@@ -1423,6 +1451,7 @@
 
 	service = new0(struct service, 1);
 	service->chrcs = queue_new();
+	service->incl_services = queue_new();
 	service->client = client;
 
 	gatt_db_attribute_get_service_data(attr, &service->start_handle,
@@ -1459,13 +1488,29 @@
 	return service;
 }
 
+static void on_service_removed(void *data, void *user_data)
+{
+	struct service *service = data;
+	struct service *removed_service = user_data;
+
+	if (queue_remove(service->incl_services, removed_service))
+		g_dbus_emit_property_changed(btd_get_dbus_connection(),
+							service->path,
+							GATT_SERVICE_IFACE,
+							"Includes");
+}
+
 static void unregister_service(void *data)
 {
 	struct service *service = data;
+	struct btd_gatt_client *client = service->client;
 
 	DBG("Removing GATT service: %s", service->path);
 
 	queue_remove_all(service->chrcs, NULL, NULL, unregister_characteristic);
+	queue_remove_all(service->incl_services, NULL, NULL, NULL);
+
+	queue_foreach(client->services, on_service_removed, service);
 
 	g_dbus_unregister_interface(btd_get_dbus_connection(), service->path,
 							GATT_SERVICE_IFACE);
@@ -1567,11 +1612,71 @@
 	queue_push_tail(client->services, service);
 }
 
+static bool match_service_handle(const void *a, const void *b)
+{
+	const struct service *service = a;
+	uint16_t start_handle = PTR_TO_UINT(b);
+
+	return service->start_handle == start_handle;
+}
+
+struct update_incl_data {
+	struct service *service;
+	bool changed;
+};
+
+static void update_included_service(struct gatt_db_attribute *attrib,
+							void *user_data)
+{
+	struct update_incl_data *update_data = user_data;
+	struct btd_gatt_client *client = update_data->service->client;
+	struct service *service = update_data->service;
+	struct service *incl_service;
+	uint16_t start_handle;
+
+	gatt_db_attribute_get_incl_data(attrib, NULL, &start_handle, NULL);
+
+	incl_service = queue_find(client->services, match_service_handle,
+						UINT_TO_PTR(start_handle));
+
+	if (!incl_service)
+		return;
+
+	/* Check if service is already on list */
+	if (queue_find(service->incl_services, NULL, incl_service))
+		return;
+
+	queue_push_tail(service->incl_services, incl_service);
+	update_data->changed = true;
+}
+
+static void update_included_services(void *data, void *user_data)
+{
+	struct btd_gatt_client *client = user_data;
+	struct service *service = data;
+	struct gatt_db_attribute *attr;
+	struct update_incl_data inc_data = {
+		.changed = false,
+		.service = service,
+	};
+
+	attr = gatt_db_get_attribute(client->db, service->start_handle);
+	gatt_db_service_foreach_incl(attr, update_included_service, &inc_data);
+
+	if (inc_data.changed)
+		g_dbus_emit_property_changed(btd_get_dbus_connection(),
+							service->path,
+							GATT_SERVICE_IFACE,
+							"Includes");
+}
+
 static void create_services(struct btd_gatt_client *client)
 {
 	DBG("Exporting objects for GATT services: %s", client->devaddr);
 
 	gatt_db_foreach_service(client->db, NULL, export_service, client);
+
+	queue_foreach(client->services, update_included_services, client);
 }
 
 struct btd_gatt_client *btd_gatt_client_new(struct btd_device *device)
@@ -1689,14 +1794,8 @@
 		return;
 
 	export_service(attrib, client);
-}
 
-static bool match_service_handle(const void *a, const void *b)
-{
-	const struct service *service = a;
-	uint16_t start_handle = PTR_TO_UINT(b);
-
-	return service->start_handle == start_handle;
+	queue_foreach(client->services, update_included_services, client);
 }
 
 void btd_gatt_client_service_removed(struct btd_gatt_client *client,